A quick guide to customizing work items in Team Foundation Server:
1: Install Team Foundation Server Power Tools.
2: In Visual Studio, connect to your TFS collection and open the Work Item Template definition on the server:
3: Select the work item template you want to edit:
4: Today, I added a “Pass/Fail” field to test case. Click “New” to add a new field.
5: You can specify a number of field types such as text, number, dropdown, etc. For a dropdown, specify a list of allowed values in the “Rules” tab
6: After you add a new field, you need to add it to the layout:
7: You can also define rules for workflow transitions that depend on your new field: